50kHz pitch shifter

[René Schmitz]

At 09:39 13.06.00 +0200, you wrote:

>And I've heard about people recording bats. Now , tape recorders are made
>for the audio band, they will not work. Same applies for most sampling 
>technology. Frequency shifting will destroy harmonic relationships.
>
>Any ideas?

A few years ago there used to be an article in Elektor describing a device 
with a balanced modulator that could be used to bring bat sounds into the 
audio band. I do see the point of the destroyed harmonics, but I can't 
understand bat language anyway, so the question is if this matters at all.

And a related thing is the "infra red microphone" which can be used to listen 
to the sounds of events in light. Like the "sound" of a candle or fire. 

Bye,
 René



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